package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面 实现公共字段的自动填充处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){ }

    /**
     * 前置通知 进行公共字段的赋值
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段的自动填充.....");

        //获取数据库操作类型
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取方法上的注解对象
        OperationType type = autoFill.value();
        //获取实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length ==0){
            return;
        }
        Object entity = args[0];
        //准备赋值数据
        LocalDateTime time = LocalDateTime.now();
        Long id = BaseContext.getCurrentId();
        //判断数据库操作类型是insert还是update
        if (type == OperationType.INSERT){
            try {
                //获取四个公共字段的赋值方法
                Method setCreatTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreatUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                //通过反射赋值
                setCreatTime.invoke(entity,time);
                setCreatUser.invoke(entity,id);
                setUpdateTime.invoke(entity,time);
                setUpdateUser.invoke(entity,id);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if(type == OperationType.UPDATE){
            try {
                //获取两个公共字段的赋值方法
                Method setUpdateTime = setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射赋值
                setUpdateTime.invoke(entity,time);
                setUpdateUser.invoke(entity,id);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
        //通过反射来赋值
    }

}
